Measuring 10.6 x 6.4 mm this bead was acquired from James Keats. The ancients had a great desire to have beads that looked like this. They learn to color them and create what are known as dzi beads.
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This bead has a gorgeous, matte finish, incredible end wear and a nicely worked bead hole. It is possible this bead is from Bactrian or other early civilizations.